Awesome! I just switched from Chrome to Vivaldi a short while ago. The final drop to make me move was the introduction of this "feature" where I couldn't turn off my Spotify in the background anymore once I opened a YouTube video. In Chrome I could not figure out how to disable the media keys. Glad there's a solution here!

But I think this needs a dedicated setting in the normal preferences - if there is none yet: where do I send the request to?
Ah, I'll figure it out. Just wanted to give some feedback and a +1 here. Some features are meant well, but just don't provide any benefit while interfering with existing routines